Towards a Framework of Choices Made During the Lifecycles of Process Models

A variety of process modelling approaches exist. The tools provide visualizations and enable analyses of a process. However, analyses of a process depend fundamentally on the properties of the underlying process model. Choices that modellers make in building process models affect the quality of the created models and have an effect on what the models can be used for and can affect the process that is modelled. This paper reflects over the choices the processes modellers need to make in the course of building processes and proposes a framework to show how the choices are related to each other

Ultraviolet protection on a snowball Earth

Habitats in the Antarctic provide an insight into habitats available on snowball earth. Physical UV protection on snowball earth would have been dominated by the manifestations of ice and snow in different habitats. The snowball period was a golden age of UV protection

A Visual Approach to Community Bank Assessment of Agricultural Portfolio Risk Exposure

Financial Economics, Risk and Uncertainty,

Community Bank Assessment of Agricultural Portfolio Risk Exposure: The Literature and the Methods in Use

Agricultural Finance,

THE CHANGING INFORMATION NEEDS OF FARMERS IN THE U.S. AND EUROPE

Both policy and market forces are causing unprecedented changes in agricultural structure and management in both the United States and in Europe. These changes will have profound impacts on the role of universities and extension services who provide information and education to farmers. This paper discusses some of the emerging and anticipated changes in information content and delivery in both the US and the EU. Some of the primary issues US agricultural producers will need to address as a result of the changes in the agricultural industry and policy include: strategic positioning, transferring management capabilities, frequent performance monitoring, evaluating new technology, monitoring external factors, managing information, and accountability. The information needs of farmers in Europe are closely linked to the evolution of the Common Agricultural Policy (CAP) of the European Union. The general agricultural policy framework is briefly presented in the paper. Price reduction, agri-environmental measures enhancement, and rural development policy are the most important elements of CAP reform. European agriculture is in the midst of major changes, mostly started in 1992, but destined to continue and increase in the near future. Different approaches to manage the agricultural sector involve the need for a different information system for farmers. It means not only new content in information, but also new ways to inform and do technical assistance. The primary information needs out are: farm management, risk management, EU programs and measures, quality production, low input and organic farming, marketing and advertising management, new technology introduction, structural adjustment funds management, investment decisions, rural tourism and recreational activities management. European agriculture is on the path to large and challenging changes. There is no way for farmers alone to manage these changes, and remain competitive in the market. Providing information has become the most important part of the extension activity. Information must include training sessions, demonstrations in the field, and assessment, together with the farmers, of the activities and the results obtained. There are many similarities in the farm management information needs of farmers in the US and EU. A critical factor for the Extension Services in the future is to adjust rapidly to the changes, and quickly develop new content and delivery plans for farmers' training. The challenge for universities and extension services to respond to the information needs will strain their resources. Collaborative efforts between our institutions may prove more valuable as faculty attempt to develop research and educational programs relevant to the emerging information needs. In addition, cooperation with the growing private sector agricultural education programs will probably be essential if public education and information delivery systems are to remain relevant.Farm Management,

Phrygillos, a die-engraver for Syracuse, and his association with certain South Italian mints

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Effectiveness of Evaporation from Ground and Foliage in Reducing Soil Moisture Depletion

Field irrigation efficiency is the percentage of the water delivered to the field that becomes available to the crop as soil moisture. The so-called evaporation losses from wetted ground and foliage are rather difficult to measure, but are estimated by Christiansen (3) to be between 15 and 30 percent. No doubt part of this may be termed as a loss, but the other part may be incorrectly termed as such. Many authorities claim that water must pass through the plant before being transpired into the atmosphere to be effectively used

DD-optimal saturated designs: a simulation study

In this work we focus on saturated $D$-optimal designs. Using recent results, we identify $D$-optimal designs with the solutions of an optimization problem with linear constraints. We introduce new objective functions based on the geometric structure of the design and we compare them with the classical $D$-efficiency criterion. We perform a simulation study. In all the test cases we observe that designs with high values of $D$-efficiency have also high values of the new objective functions.Comment: 8 pages. Preliminary version submitted to the 7th IWS Proceeding

Assessing the Viability of Complex Electrical Impedance Tomography (EIT) with a Spatially Distributed Sensor Array for Imaging of River Bed Morphology: a Proof of Concept (Study)

This report was produced as part of a NERC funded ‘Connect A’ project to establish a new collaborative partnership between the University of Worcester (UW) and Q-par Angus Ltd. The project aim was to assess the potential of using complex Electrical Impedance Tomography (EIT) to image river bed morphology. An assessment of the viability of sensors inserted vertically into the channel margins to provide real-time or near real-time monitoring of bed morphology is reported. Funding has enabled UW to carry out a literature review of the use of EIT and existing methods used for river bed surveys, and outline the requirements of potential end-users. Q-par Angus has led technical developments and assessed the viability of EIT for this purpose. EIT is one of a suite of tomographic imaging techniques and has already been used as an imaging tool for medical analysis, industrial processing and geophysical site survey work. The method uses electrodes placed on the margins or boundary of the entity being imaged, and a current is applied to some and measured on the remaining ones. Tomographic reconstruction uses algorithms to estimate the distribution of conductivity within the object and produce an image of this distribution from impedance measurements. The advantages of the use of EIT lie with the inherent simplicity, low cost and portability of the hardware, the high speed of data acquisition for real-time or near real-time monitoring, robust sensors, and the object being monitored is done so in a non-invasive manner. The need for sophisticated image reconstruction algorithms, and providing images with adequate spatial resolution are key challenges. A literature review of the use of EIT suggests that to date, despite its many other applications, to the best of our knowledge only one study has utilised EIT for river survey work (Sambuelli et al 2002). The Sambuelli (2002) study supported the notion that EIT may provide an innovative way of describing river bed morphology in a cost effective way. However this study used an invasive sensor array, and therefore the potential for using EIT in a non-invasive way in a river environment is still to be tested. A review of existing methods to monitor river bed morphology indicates that a plethora of techniques have been applied by a range of disciplines including fluvial geomorphology, ecology and engineering. However, none provide non-invasive, low costs assessments in real-time or near real-time. Therefore, EIT has the potential to meet the requirements of end users that no existing technique can accomplish. Work led by Q-par Angus Ltd. has assessed the technical requirements of the proposed approach, including probe design and deployment, sensor array parameters, data acquisition, image reconstruction and test procedure. Consequently, the success of this collaboration, literature review, identification of the proposed approach and potential applications of this technique have encouraged the authors to seek further funding to test, develop and market this approach through the development of a new environmental sensor